Javascript gives trackers potent tools. Chrome allows you turn off javascipt altogether, but that breaks most of the internet. Chrome does not allow users to turn on Javascript in a granular way, so I use Firefox with the excellent, open source tool called No Script. No Script shows all the scripts that are trying to run (you may be amazed at how many there are), and it allows a user to turn on specific scripts to facilitate functionality without allowing unfettered access to your browser and computer.